Paris Accords were signed, game over.
The game was over long before the Paris Accords. As I said, Johnson would not allow the US to win. Handcuffed the military. Remember the NVA was shooting at the last planes leaving Saigon.
They sure the heck weren't after the Easter Offensive. Remember not much happend in 1974.
Actually I should say 1973, by 1974 they'd starting probing to see if we would provide airsupport.
But you're right, had LBJ pulled his head out the war would never have gotten to Tet.